Those who’d enabled Gzip through Litespeed (unconfirmed on other servers) might find that the spellchecker in WordPress 2.5 no longer works. This is due to TinyMCE not decompressing the compressed output into plain text (my speculation).

To fix this, edit /wp-includes/js/tinymce/plugins/spellchecker/rpc.php

Change the following line:

header(‘Content-Type: text/plain’);

to

header(‘Content-Type: text/xml’);

or anything that Litespeed is not set to compress (Usually anything other than text/plain, text/html and application/x-php).

Many bloggers complained that their posts begin appearing in reversed orders after their webhost upgraded to MySQL 5.0.5x. This is caused by a bug in the MySQL database server affecting versions 5.0.50, 5.0.51 and 5.0.51a  (MySQL Bug #30596).

The bug can be reproduced by any SQL Select command that couples both GROUP BY and ORDER BY clauses and does not affect WordPress alone.

The work around for this problem is outlined below:

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As promised, this is the first instalment to a 3-part WordPress optimisation guide.

Part 1 – The Obvious
This article deals with common and easily done tweakings that don’t require root/super user access to your webserver. This article mainly targets bloggers in a shared hosting environment.

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Gzip compression is among the missing features in WordPress 2.5. To restore the functionality, you have but not limited to the following choice:

1. Application wide using Apache/Litespeed .htaccess

2. Gzip-ing via Index.php
3. Site wide using your webserver’s modules
4. PHP wide using php.ini

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Users who have recently upgraded to WordPress 2.5 might have noticed that the WordPress object cache is disabled, or rather gone forever: define(‘ENABLE_CACHE’,true) no longer has any effect.

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